heres my issue. im taking a course on pc repair, i had to take out the cpu and just look at it then put it back. I was careful as not to cause any static discharge. After putting the cpu back in place and starting the os, the monitor reads self test, your monitor is working, check the video and cable and pc. I get no other display on the monitor. I did however recieve a stop error screen one time and it read: stop: 0x0000007F (0x00000000, 0x00000000, 0x00000000, 0x00000000) any help would be greatly appreciated.